These backpacks are made of 600 d polyester. They have padded backs, one large main pocket and one front pocket. Each case of 48 backpacks contains 8 black, 6 navy, 6 red, 4 dark green, and 2 each of: purple, light blue, yellow, gray, pink, lilac, silver, beige, turquoise, neon pink, orange, and lime. The backpack dimensions are 12" wide X 6" deep X 18" tall.